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1/2 . 4^x . 4^1 - 5 . 2^x + 2 = 0
1/2. (2^x)² . 4 - 5 . 2^x + 2 = 0
misal 2^x = a
2a² - 5a + 2 = 0
(2a - 1)(a - 2) = 0
a = 1/2 atau a = 2
2^x = 2^-1 2^x = 2^1
x = -1 atau x = 1
jadi HP = (-1, 1)